Sel SEL-421 - Circuit Breaker Failure Protection Logic Settings; Circuit Breaker Failure Relay Word Bits

R.1.122
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Circuit Breaker Failure Protection
Table 1.74 Circuit Breaker Failure Protection Logic Settings
a
a
For Circuit Breaker 2, replace 1 with 2 in the setting label.
Setting Description Range
Default
(5 A)
50FP1 Phase Fault Current Pickup—BK1 (A) 0.50–50 6.000
BFPU1 Breaker Failure Time Delay—BK1 (cycles) 0.000–6000 9.000
SPBFPU1 Single-Pole Trip Circuit Breaker Failure
Time Delay—BK1 (cycles)
0.000–6000 6.000
RTPU1 Retrip Time Delay—BK1 (cycles) 0.000–6000 3.000
RT3PPU1 Three-Pole Retrip Time Delay—BK1
(cycles)
0.000–6000 3.000
BFI3P1 Three-Pole Breaker Failure Initiate—BK1 SEL
OGIC Equation NA
BFIA1 A-Phase Breaker Failure Initiate—BK1 SEL
OGIC Equation NA
BFIB1 B-Phase Breaker Failure Initiate—BK1 SEL
OGIC Equation NA
BFIC1 C-Phase Breaker Failure Initiate—BK1 SEL
OGIC Equation NA
BFIDO1 Breaker Fail Initiate Dropout Delay—BK1
(cycles)
0.000–1000 1.500
BFISP1 Breaker Fail Initiate Seal-In Delay—BK1
(cycles)
0.000–1000 2.000
ENCBF1 No Current/Residual Current Logic—BK1 Y, N N
50RP1 Residual Current Pickup—BK1 (A) 0.25–50 1.00
NPU1 No Current Breaker Failure Delay—BK1
(cycles)
0.000–6000 12.000
BFIN1 No Current Breaker Failure Initiate—BK1 SEL
OGIC Equation NA
ELCBF1 Load Current Breaker Logic Failure—BK1 Y, N N
50LP1 Phase Load Current Pickup—BK1 (A) 0.25–50 0.50
LCPU1 Load Pickup Time Delay—BK1 (cycles) 0.000–6000 9.000
BFILC1 Breaker Failure Load Current
Initiation—BK1
SEL
OGIC Equation NA
EFOBF1 Breaker Failure Flashover Logic—BK1 Y, N N
50FO1 Flashover Current Pickup—BK1 (A) 0.25–50 0.50
FOPU1 Flashover Time Delay—BK1 (cycles) 0.000–6000 9.000
BLKFOA1 Block A-Phase Flashover—BK1 SEL
OGIC Equation NA
BLKFOB1 Block B-Phase Flashover—BK1 SEL
OGIC Equation NA
BLKFOC1 Block C-Phase Flashover—BK1 SELOGIC Equation NA
BFTR1 Breaker Failure Trip—BK1 SEL
OGIC Equation NA
BFULTR1 Breaker Failure Unlatch Trip—BK1 SEL
OGIC Equation NA
Table 1.75 Circuit Breaker Failure Relay Word Bits
a
(Sheet 1 of 2)
Name Description
BFI3P1 Three-pole circuit breaker failure initiation
BFIA1 A-phase circuit breaker failure initiation
BFIB1 B-phase circuit breaker failure initiation
BFIC1 C-phase circuit breaker failure initiation
BFIN1 No current circuit breaker failure initiation